反应详情

A 1,000 ml. glass polymerization vessel equipped with a reflux condenser, a dropping funnel, a thermometer and a stirrer was charged with 320 parts of vinyl acetate, 130 parts of methanol, 15 parts of 30% aqueous solution of sodium ethylenesulfonate and 0.2% by mole of azobisisobutylonitrile per the vinyl acetate. After carrying out the polymerization at a temperature of 60° to 65°C. for 8 hours, the residual vinyl acetate was removed by a conventional method to give vinyl acetate-sodium ethylenesulfonate copolymer containing 2.3% by mole of sodium ethylenesulfonate unit. Then the copolymer was hydrolyzed by a conventional method to give a modified PVA of which degree of hydrolysis in vinyl acetate unit was 99% by mole.

1. customglass polymerization vessel
2. customequipped with a reflux condenser, a dropping funnel
3. customthe polymerization at a temperature of 60° to 65°C. for 8 hours
4. customthe residual vinyl acetate was removed by a conventional method